Abstract
In the end of 2006, only 3.3%areas of Taiwan cities’ land was used to be green land or parks. As to cities in Taiwan have limited land for developing, city parks face pressure for multi-use, especially for underground development. Although the building codes of Taiwan have already ruled the green building items since 1993, the underground building in parks are not include of the green building items besides green building materials. Because of the influence on ecological impact from underground building development, it is essential to review the green building regulation items and to improve the green building evaluation system. Several important findings obtained in the research are described as follows. (1) Latest decades, Taiwan private cars are raised rapidly that caused a large number of facilities demands for parking lots. Under the government finance difficulty, it is hard to buy more land for the facilities demands, so underground development will not avoid in future. The small park that smaller than 1 hectare and beside community will cause greater influence for original design function of the park when developing underground building. The local government should hold public hearing before the final decision. (2) For recent census data, the tree diameter at breast height and the diameter of tree crown above the underground parking lots in the parks are smaller than the same kind of trees on other areas. The trend seems that those trees above the underground building are growing slower than other trees of the park. (3) There are high repetitiveness tree kinds in Taiwan city parks. It might damage the ecological stability of the city in future.